Use -mtime oder -ctime to find old backup files

[plettich]

The atime or access time is often disabled on Linux for performance reasons. We should use -mtime or -ctime to find old backup files here:

privacyidea-appliance/authappliance/lib/appliance.py

Line 46 in 70d080b

BACKUP_CLEAN_CMD = "find {backup_dir} -atime +{backup_days} -delete"

[marcohald]

We have the same issue, on our system only mtime seems to work

root@privacyIDEA:~# find /var/lib/privacyidea/backup  -type f | wc -l
43
root@privacyIDEA:~# find /var/lib/privacyidea/backup  -type f -mtime +14 | wc -l
27
root@privacyIDEA:~# find /var/lib/privacyidea/backup  -type f -atime +14 | wc -l
0
root@privacyIDEA:~# find /var/lib/privacyidea/backup  -type f -ctime +14 | wc -l
0